Data Availability (access time since last observation)

Nominal Accuracy (primary requirement)

Sample rate (seconds)

Internet Contact Information

Real time DGPS corrections

<10m (2 drms) and 1 to 3m (2 drms) for inland sites

5–30

www.navcen.uscg.mil

0.5 hour or less

 

5–30c

www.ngs.noaa.gov/CORS/cors-data.html

1 hour

 

30

www-dd.fsl.noaa.gov/ipw_web/gps_ipw.html

minutes to 1 hour (CORS)

WAAS - 7.6 m (2 drms) LAAS - 0.6 m (vertical)

?

www.faa.gov/and/and500/AND510/AND_510.HTM

   

1–30d

milhouse.jpl.nasa.gov/

   

30

quake.wr.usgs.gov/QUAKES/geodetic/bard/

6 hours

 

1–30e

igscb.jpl.nasa.gov/

   

1–30f

www.gsi-mc.go.jp/geodetic/gps/gps.html



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